VentilationDanX Swimming pool presentation

POOL PROBLEMS

EvaporationEvaporation HumidityHumidity

ChlorineChlorine

TEMPERATURE & RELATIVE HUMIDITY

+2oC / 60% RH

26oC

The room air temperature and relative humidity is depending on the water temperature and the building structure of the swimming pool hall.

Normally the swimming pool air temperature is maintained at 2°C over the water temperature for comfort reasons.

The lower the air temperature the lower the evaporation from the pool surface. The higher the relative humidity the lower the evaporation from the pool surface.

TEMPERATURE & RELATIVE HUMIDITY

+2oC / 48% RH

30oC

The maximum absolute water contents in the air is according to VDI 2086 14.3 g/kg. Therefore the relative humidity in this example should not be higher then 48 % rh.

TEMPERATURE & RELATIVE HUMIDITY

-8oC / 50% RH

36oC

A special case are therapy pools where very often a water temperature of 36°C should be maintained.

Here the air temperature should be under the pool temperature because of comfort reasons for the personal.

CALCULATION AFTER VDI 2089

W =e x A x (Pb - Pl)

W = Evaporated water (g/h)

e = Faktor

Pb = Saturated vapour pressure pool water (mbar)

Pl = Partial vapour pressure air (mbar)

6 m

3 m

28°C

30°C / 53% 22,5 mbar

37,8 mbar

A = 6 x 3 = 18 m

Pb = 37,8 mbar

Pl = 22,5 mbar

e = 15 for privat pool

W= 15 x 18 x (37,8 – 22,5) = 4,13 l/h

CALCULATION AFTER VDI 2089

The amount of fresh air which is needed to dehumidify the swimming pool can be calculated as follows:

V = W / (Xi x Xu) x 1.2

V = Air volume (m3/h)

W = Evaporated water (g/h)

Xi = absolute water contents, inside air (g/kg)

Xu = absolute water contents, outside air (g/kg)

In practice this value is set to 9 g/kg in northern Europe.

1.2 = Density of the air (kg/m3)

V = 4130 / (14,3 – 9) x 1.2 = 650 m3/h

It is important that the air volume of the unit is about 3 – 5 times the volume of the swimming pool hall.

PROBLEM SOLUTIONS

1) Dehumidification and ventilation with a heat pump dehumidifier.

Cheap and simple solution but today normally only used in small private or hotel swimming pools because of high temperatures in the pool hall.

HEAT PUMP DEHUMIDIFIER

DanX AF

7 types with dehumidification capacities from 15 to 100 l/h

From pool

To the pool

Fresh air

PROBLEM SOLUTIONS

2) Dehumidification and ventilation with fresh air.

The first type of pool dehumidification, but today with

heat recovery. (Cross flow heat exchanger and /or a heat pump).

FRESH AIR VENTILATION

DanX XK

7 types with dehumidification capacities depending on air volume

To the pool

Fresh air From pool

Exhaust air

FRESH AIR VENTILATION

DanX XWP

18 types with dehumidification capacities from 10 to 140 l/h

To the pool

Fresh air From pool

Exhaust air

UNIT CONSTRUCTION

Cold bridge free painted construction

Specially protected heat exchanger and coils

Swimming Pool Hall VentilationXWPDAY TIME

15oC/95%19oC 22oC

28oC/55%13,1g/kg

34oC/22%6,9g/kg

9oC/80%5,7 g/kg

13oC

15oC

70%

34oC

34oC

20oC 23oC

28oC/55%13,1g/kg

35oC/28%10,3g/kg

35oC

15oC

Swimming Pool Hall VentilationXWPNIGHT TIME

20oC35oC

32oC/35%

30oC

30oC/60%15,9g/kg

18oC/80%10,5g/kg

40oC20oC

Swimming Pool Hall VentilationXWPCOOLING MODE

42oC/30%

26oC/50%10,5g/kg

26oC30oC/60%

OLD SYSTEM – NO HEAT RECOVERY

Euro

ENERGY CONSUMPTION

9/18 WP 9/18 XK 9/18Energy consumption total: Heating coil 36792 313864 481800 kwh/year

Power consumption total: Compressor 84717 0 0 kwh/yearFans 115880 88768 70664 kwh/year

Total kwh/year: Electicity 200597 88768 70664 kwh/yearFuel 36792 313864 481800 kwh/yearSurplus energy from the heat pump 84717 0 0 kwh/year

Cost: Price electricity 0,04 0,04 0,04 /kwhPrice fuel 0,28 0,28 0,28 /L

Cost electricity 8525 3773 3003 Euro/yearCost fuel 1010 8616 13226 Euro/year

Cost total 9535 12389 16229 Euro/year

Cost saving through surplus energy 2326 Euro/year

DanX CALCULATION PROGRAM

DanX

DanX

Thank you for your attention!

www.dantherm-air-handling.com